Establishing Weld Parameters

From the above cycle description, it can be seen that the weld characteristics are controlled by three parameters:

Surface Velocity

Moment of Inertia Weld

Thrust Pressure

Each of these parameters is fully adjustable over a broad range to meet the needs of each application. Each material and joint interface geometry will have its own range of velocities, pressures, and energy levels. Years of research with this process have established similar information about most of the common materials and sizes.

Since weld parameters (speed, thrust, and inertia) can be calculated, one can expect to make a good weld on the first try with most common materials. Several sample welds should be made for each new application to optimize parameters. Factors to be considered in adjusting parameters include: produce an even heat-affected zone across the joint, minimize upset (length loss), optimize flash appearance, eliminate notch effect, minimize weld hardness, compensate for surface conditions and others. Of course, all factors cannot be optimized at once-there are trade-offs. These adjustments are possible because precise weld parameters are not critical. Sound welds can be produced within a fairly broad range of surface speed, thrust or inertia. There are limits on these parameters, though, for each material combination. In the course of sample testing to establish parameters, the value of upset also will be established. Once determined for a particular part, upset is consistently maintained within plus or minus five percent provided interface squareness and cross sectional area is reasonably uniform.

Basic Joint Types

The process requires that the joint face of at least one of the parts be essentially round. Good welds are obtained with octagonal and hexagonal sections- even greater deviations from the ideal circular shape can be welded to larger sections using special techniques. Angular orientation of two welded parts, however, is not currently available. Similarly, the basic joint must be a butt weld since the process involves thrusting one part axially against the other. Five basic types of joints are possible, each with different flash flow patterns:

Tube to tube

Tube to bar

Tube to disc

Tube to plate

Bar to bar

Bar to plate

Size Capabilities

Starting with one inertia/friction welding machine, Interface now has more than a dozen. The weld size capacity ranges from:

1/8″ to 3″ in diameter of solid bar

Tubular sizes range from 1/8″ to approx. 9.5″in diameter

Much of the tooling required is standard and stocked. Special tooling is designed and built in our own toolroom.

Quality Control

Inertia weld quality depends largely upon the use of predetermined and pre-tested parameters which are then repeated within very close tolerances.

The key for measuring the repeatability is in the up-setting or relative change in length of the weldments. This dimensional change and its tolerance are established by running test lots the same tests used to determine proper parameters. Essentially a weldability and machine capability study must be conducted for each application.

For example: a job in production at the present, upsets .020 inch plus and minus .003 inch. Tests have confirmed that this job meets all specifications with an upset as low as .012 inch and as high as .035 inch so obviously, if the machine maintains .017 inch to .023 inch, the quality is guaranteed.

Ultimate Tensile Test

Limitations

Material limitations arise because inertia welding involves frictional heating and drastic hot working of the joint. Materials to be welded cannot be good dry bearing materials and must be malleable at high temperature. The principal metallurgical characteristic that limits ability to be inertia welded is the presence of a distinct, brittle phase in the structure – graphite, manganese sulfide, free lead, tellurium. The most important class of materials excluded is cast iron in any form – gray iron, nodular, or malleable. The free graphite acts as a lubricant – limiting frictional heating. Bronzes and brasses having a high lead content (over 0.3%) are similarly unweldable.

GALLERY

NEWS

About Us

Since 1967, Interface Welding has been producing inertia/friction welds with particular emphasis in bi-metal fabrications. We provide a complete inertia welding service and a variety of companies have been using our products successfully for 50 years.

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